Re: Good grief, my logo....
By logo I’m assuming you mean your avatar?
To change the dimensions of a graphic in Photoshop go to the top menu; select Image then select Image Size, a dialogue box will open. Make sure “Constrain Proportions” is checked (towards the bottom), then look towards the top of the box for the section that say Pixel Dimensions: in the Width or the Height section type in what size you want (For example, an avatar can not be any larger than 100 pixels by 100 pixels, so you would make the largest dimension 100 pixels).
Last thing, look for the line that says Resolution: make sure the drop down box on the right says pixels/inch and type in 72 in the box on the left (that is if the final output is for the web).
Let me know if this helps.
"Be kind, for everyone you meet is fighting a hard battle."